The standard flight rule for all aircraft is to avoid any thunderstorm activity, and yet Frank shows no fear by staying on course.

所有飞机的标准飞行准则是要避免雷暴活动，而Frank还是照原路前进，没有丝毫恐惧。

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An important rule is to drink plenty of water during any flight.

一条重要的原则是在任何一次飞行中都要喝大量的水。

《柯林斯英汉双解大词典》

The carrier shall limit the number of passengers carried on any flight at fares governed by this rule.

航空公司将限制每个航班上使用此运价的旅客数量。

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So, even though Congress ordered the FAA to issue a rule prohibiting airline flight crews from personal use of electronic devices in the cockpit in January of last year, no rule has been issued to date.

FORBES: FAA Foot-Dragging on Rule to Prohibit Texting and Flying

But for travellers who dread the prospect of a long taxi ride on top of a cross-country flight, the perimeter rule is an unnecessary hassle.

ECONOMIST: Airports in Washington, DC: Breaching the perimeter | The

No flight has been that dismal since the rule was put in place, the DOT said.

WSJ: The Worst Flight in America